Covered jar.



G. M. GONRADSON. GOVERED JA.R. APPLIOATIOH mum my 19, 1906.

Patented Dec. 22, 1908.

2 SHEETS-SHEET 2.

45 I may be produced by will be so constructed that- Specification ofLetters Patent.

Patented Dec. 22, 1-908.

Application filed May 19, 1906. Serial- No. 817,678.

To all whomz't may concern:

Be it known that I, CONRAD M. CONRAD- SON, a citizen of the UnitedStates, residing in Madison, in the county of Daneand State of isconsin,havev invented certain new and useful Improvements in Covered Jars, ofwhich the following is a specification.

This invention relates and has for an object to provide an improvedcovered jar, and more particularly one wherein a jar and its cover willbe m-ade'out of y a series of interlocking faces the cover will besecurely seated upon thejjar. It is impossible in blowing glass toproduce exact faces for engagement, .as for instance the faces of thelugs upon the jar and cover respectively which] are to engage; but bymyimprovement by properly positioning and proportioning these lugs andaccurately grinding the meeting edges of the jar and cover where theseevenness in the lugs will. merely suffice to cause "the two faces toslide one, upon the other and securely seat the coverup'on the In thedrawings accompanying and forming a part'of thisspecification, Figure 1is a side view of a jar having itsneckand its cover shown in centralsection to illustrate a practicable form of myinvention applied to thejar. Fig. 2 1s a view 'on a plane in about the line 2' 2 of Fig. 1looking down- ,wardly. Fig. an enlarged side view 'of 4 perspective viewof the upper portion of the jar. Fig. 4 is a ,a jar showing only theupper portion; and Fig. 5 is an enlarged perspective view of a cover.

1 A jar body 7 is shown having a contracted nec portion 8 and a shoulderortion 9. The neck 8 is in the main cylin rical and has about it anumber of lugs; in the present instance there are shown three lugs orprojections 10, which project, outwardlv,and these are equally spaced,apart; such lugs a blowm process, and the neck will have cavities orepressions 11 behind these lugs. The engaging=face 12 ofwhich lug isshown as helicoidally disposed relative to the perpendicular of the jaraxis. In the. present mstance it will be seen that in Fig. 3 the end 14ofthe lug is lower than the end 15 from the horizontal face 16 upon theneck, and which face is to afford a seat-for a face 17 upon aflange 30lass and these come together the unstructure which will 20 will merelycarried by the cover 18 of the jar. The faces 16 and 17 will beaccurately mind so that the entire portion of each wil lie in the sametrue plane. Such cover will have lugs 19 for coeperation with the lugs10 and the engagin" faces 20 of these may also be dispo'sedheicoida-lly. It will be seen by reference to Fig. 5 that the end 21 ofthe lug is thinner than the end 22. By reference to Fig. 1 it will beseen that the side wall or flange, as it may be called, 23 of the cover,

,tends out over the shoulder 9, but does not extend beyond the outerperimeter of the jar; it extends out, however, a sufficient distance tomake a symmetrical structure when in place. 7 It will be seen that theflange 30 is carried by the cover and is disposed inwardly of the flange23 which .carries the lugs 19. The chamber or channel 31 between theflanges 30 and'23 renders it possible to face 17 of the flange 30 andget the same disposed upon a true plane with much greater ease than werethis flange not present. The side of the flange 23 may be made in someshape which will grasping surface for the present instance this mayseries of channels 24, leaving between these a series of ribs 25, thusproducing a fluted give a suflicient gnp hand, and in the grind the abeproduced by a for the fingers whereby the lid may be so curely seatedupon thejar, the shapeof the faces 20 and 12 being such that the seatingwill be done in a right hand movement or in 'the direction of the arrow26 in Fig. 2.

In the usual methods of manufacturing jars it will be highlyimpracticable in many instances to produce the faces 12 and the faces 20wfih such accuracythat-thesewill register up sufficiently to draw thefaces 16 and 17 together, unless such faces 16 and 17 are ground withabsolute precision and there is a certain amount of play between thefaces 12 and 20 until these have been drawn up to the tighteningposition. Any ununiformity which may exist between such faces 12 andcause the face 17 to slide upon the face 16 until the parts have beenbrought into proper position for lockin when a further rotation .of. thelid relative to the jar will cause a firm and uniform seating of theface 17 upon the face 16. Jars made according to my prwent. improvement,'and the meeting faces 16 and 17 being ground. wgfh absolute precisionwill be interchangea e.

I By placing the lugs 10 in suitable relation to each other and to theneck8 by which they are carried the top face 16 of this neck may be madecircular and the general con tour of the neck cylindrical.

By having three lugs upon the jar for the engagement of three lugs uponthe cover a self centering action is had which is not possible with anyother number. I do not confine myself in all instances to the use ofsuch number of lugs when the other features of my invention areemployed.

Having described my invention I claim:

1. The combination with a jar havlng a. neck provided with downwardlyfacing helicoidal' engaging faces, of a cover carrying a flange providedwith inwardly directed lugs provided with upwardly facing helicoidalengaging faces mating with the faces on said neck, said jar having anupwardly facing cover seat ground to a true plane, and said covercarrying a flange disposed inwardly of said lug carrying flange andprovided with a face ground to a true plane seating upon the said coverseat.

2. The combination with a glass jar having a cylindrical body portion, aneck of less diameter than the body, and a shoulder formed between theneck and body, said neck having integral outwardly projecting lugs uponit, the edge of said neck being round to a true plane, a glass cover forsaid ar having a flange for surrounding said neck and when in positionoverlying the shoulder, integral inwardly projecting lugs upon saidflange for cooperation with the lugs upon the neck, and said coverhaving a flange within said lug carrying flange provided with a faceground to a true plane for seating upon: the edge face of the neck.

3. The combination with a glass jar having an upstanding neck in thenature of a flange, the edge of said neck being ground to a true plane,said neck having three integral outwardly projecting lugs provided forsaid ground to a'true plane for seating upon the said edge face of theneck, and having three integral lugs provided with" faces for engagementwith the lugs upon the neck.

' CONRAD M. CONRADSON.

itnesses p CHAS. LYON RUSSELL, FRED. J. DOLE.

